Combined hydraulic and knuckle-joint press



(No Model.)

A. FITTS.

` GOMBINBDHYDRAULIG'AND KNUGKLB'JOINT PRESS.. No. 371,049. Patented Oct. 4, 1887.

WIT/VESSES: /IVVENTR ATTORNEY N. PETERS. Pham-Lithograph", WMWM. D. C.

UNTTED STATES PATENT OrmesC ABRAHAM FITTS, `OF VORCES'IER, MASSACHUSETTS.

COMBINED HYDRAULIC AND'KNUCKLE-JOINT PRESS.

SFECIFICATION forming part of Letters Patent No. 371,049, dated @ctcbsr 4, 1887.

Application filed March 29, 1886. Serial No. 197,060. (No model.)

To aZZ whom it may concern.-

Be it known that l, ABRAHAM FITTs, acitizen of the United States, residing at Worcester, in the county of Worcester and State of Mas sachusetts, have Y invented certain new and useful Improvementsin Combined Hydraulic and Knuckle-Joint Presses; and I declare the following to be a description ofmy said invention sufficiently full, clear, and exact to enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to improvements in combined hydraulic and knuckle-joint presses of that kind described in Letters Patent No. 295,159, of March 18, 1885, the object of my present invention being to provide a press for purposes wherein more rapid action with short distance of movement is desirable-as for the embossing or stamping of sheet-metal plates or other articles; and my invention consistsin arranging the knuckle-joint arms and hydraulicpower cylinders to be doublc-acting, or so as to work to equal extent in both right and left directions past the centers or plane in which the arms stand when in direct line with each other and the knuckle-joints. These ob jects I attain by mechanism constructed and combined for operation as illustrated in the accompanying drawings, and hereinafter more fully described.

In the drawings, Figure 1 is a front view of the press constructed in accordance with my invention, one of the cylinders being shown in section, and dotted lines being employed to indicate the movement of the cylinders and arms; and Fig. 2 is a vertical central section transversely of the press. l

-In reference to parts, A denotes the head of the press; A', the foot; B, the upright standards or connecting-bolts; C, the follower; D,

the embossing-dies; E E', the knuckle-joint arms; F, the hydraulic-pressure cylinders, the heads F' of which form the knucklejoints for said arms. G indicates the piston; H, the piston-rods, and H the central hub connecting the two piston-rods and working on the vertical guiderod I, which rod is secured in the standard I, that depends from the follower C, and is arranged to slide within the standard I2, that extends up -from the foot-piece A, or

vice versa. K K indicate the flexible pipes for conducting the water to and from the interiorspaces ofthe cylindersF at opposite sides ofthe piston G. J indicates the supply, L the discharge, and M the cock for directing the flow of water through the several pipes for operating the cylinders inwardor outward,as desired.

The connecting-joints e, whereby the extremis ties of the arms E E are attached to the foot A and follower C, are located near the outer ends of said follower Gand foot A,so that when the knuckles F are at their extreme inward position or brought together near the hub H', as shown in full lines on Fig.1, the arms E E will have an outward inclination from the knuckles to the joints E, and then when the rk nuckles F are moved outward by theaction ofthe cylinders the arms E E will swing past a vertical position, or beyond a plane passing through the centers ofthe upper and lower pvots c, and when the knuckles have reached their outward position atf said arms will have an inward inclination, as indicatedby dotted lines in Fig. l. v

rI`he upper and lower joints e being in a plane intermediate between the limits ofmovement of the cylinders or knuckle-joints F, it will be seen that a single out-ward movement of the knuckles will cause thcfollowerG to approach the head for closing the dies D, and also to recede from the head for again opening said dies, and that like action will occurA on the inward movement of the cylinders and knuckles, thus giving double action of the pressing mechanism or dies D with a single movement of the cylinders.

The cylinders F are constructed for double action or for giving force at both sides of the pistons G, so as to exert power when moving the arms inward or outward, the general construction of the cylinders and pistons being somewhat similar to that described in the patcnt above named.

Reliefsprings N may be arranged on the end of the standard above the-head A to prevent damage to the mechanism by crushing strain when the arms pass the center. By arranging the parts in the manner described, a combined hydraulic and knuckle-joint press is produced which can be practically and successfully used for embossing purposes and similar work, the

speed at which the dies open and close being sueiently rapid to accomplish the requisite quantity of work, while the hydraulic cylinders are not required to be speeded beyond a practical degree in the use of hydraulic-pressure mechanism.

What I- claim as my invention, and desire to secure by Letters Patent, is

1. Theherein-described combined hydraulic and knuckle-joint press,having two oppositelydisposed pairs of knuckle-joint arms respectiVelyV arranged to operate outward and inward in both right and left directions past their centers or vertical planes passing through the axes of the upper and lower end joints of the respective pairs of arms, substantially as and for the purpose set forth.

2. The combination, substantially as described, with the foot A and follower G,of the double-acting cylinders F, carrying knuckles F, and the arms E,jointed to said head and. follower at e in a plane intermediate between the limits of movement of the cylinders or knuckle-joints F.

3. The combination, substantially as described, of the follower C and head A, provided with standards I and Il, the double-acting hydraulic cylinders carrying the knucklejoints F', the arms E E', the piston rods H, having pistons G, the central connecting-hub, H', and the guide-rod I, all constructed and arranged in relation to each other for operation as and for the purpose set forth.

Vtitness my hand this 24th day of Febru-I ary, A. D. 1885.

vABR AHAM FITTS.

Witnesses:

CHAs. H. BURLEIGH, S. R. BARTON. 

